linux-kernel - [PATCH 1/6] drm/fb_cma_helper: add suspend helper

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Date:	Tue, 19 Apr 2016 10:55:05 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	dri-devel@...ts.freedesktop.org, stefan@...er.ch, airlied@...ux.ie
Cc:	alison.wang@...escale.com, jianwei.wang.chn@...il.com,
	meng.yi@....com, alexander.stein@...tec-electronic.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] drm/fb_cma_helper: add suspend helper

Implement a suspend/resume helper for CMA users which calls
drm_fb_helper_set_suspend.

Suggested-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 drivers/gpu/drm/drm_fb_cma_helper.c | 15 +++++++++++++++
 include/drm/drm_fb_cma_helper.h     |  1 +
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index bb88e3d..4a8e0d4 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -411,3 +411,18 @@ void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
 		drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
 }
 EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
+
+/**
+ * drm_fbdev_cma_set_suspend - wrapper around drm_fb_helper_set_suspend
+ * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
+ * @state: desired state, zero to resume, non-zero to suspend
+ *
+ * Calls drm_fb_helper_set_suspend, which is a wrapper around
+ * fb_set_suspend implemented by fbdev core.
+ */
+void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, int state)
+{
+	if (fbdev_cma)
+		drm_fb_helper_set_suspend(&fbdev_cma->fb_helper, state);
+}
+EXPORT_SYMBOL(drm_fbdev_cma_set_suspend);
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
index be62bd3..3db8cf8 100644
--- a/include/drm/drm_fb_cma_helper.h
+++ b/include/drm/drm_fb_cma_helper.h
@@ -16,6 +16,7 @@ void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma);
 
 void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma);
 void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma);
+void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, int state);
 
 struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
 	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd);
-- 
2.8.0